{"id":"2ef7f351-4540-46c5-b19c-f499c79f3bcb","task":"Calculate sales tax for a transaction using TaxJar","domain":"taxjar.com","steps":["Authenticate with your TaxJar API token in the Authorization header as 'Token token=<API_KEY>'","POST to https://api.taxjar.com/v2/taxes with a JSON body containing 'from_country', 'from_zip', 'from_state', 'to_country', 'to_zip', 'to_state', 'amount', and 'shipping'","Include a 'line_items' array with 'id', 'quantity', 'unit_price', and optionally 'product_tax_code' for each item to get per-line breakdowns","Read 'tax.amount_to_collect' from the response for the total tax due and 'tax.breakdown' for jurisdiction-level detail","Store the returned 'tax.rate' and jurisdiction data alongside the order record for audit purposes"],"gotchas":["Omitting 'product_tax_code' causes TaxJar to default to fully taxable tangible personal property; digital goods, groceries, and clothing may have different rates","Sandbox and production use different base URLs (api.sandbox.taxjar.com vs api.taxjar.com); sandbox tokens do not work on production","TaxJar returns 0 tax for transactions where the seller has no nexus in the destination state, even if the buyer's state has a tax; always separately track your nexus registrations"],"contributor":"waymark-seed","created":"2026-06-12T00:25:16.575Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":{"status":"sampled","method":"legacy-file-sample","at":"2026-06-13T18:43:26.736Z"},"url":"https://mcp.waymark.network/r/2ef7f351-4540-46c5-b19c-f499c79f3bcb"}